Synopsis The present lexicon is not like one of the usual kind. A lexicon is usually historical in nature. This lexicon is only partly so. It does two other things. Firstly, it takes up a number of moral terms from day-to-day life, and defines them by visualizing a variety of situations in which they may be used, and seeing in what sense or senses they are used there. Secondly, it takes up a number of moral terms which may be used to designate a whole lot of situations with which we may be confronted directly or indirectly, and defines them by referring to those features in the given situations which have led us to designate them in that way. As a result, this lexicon not only takes a look at the history of moral philosophy, it also takes a direct look at our moral life.